Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f0230fd76416b1…

MALICIOUS

PDF

76.4 KB Created: 2021-05-09 17:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 290505e83d6d6ea8e682ca4da57a018a SHA-1: d6c35f5280fe42b2c1b5897b0a0fdea046c6db0d SHA-256: 23f0230fd76416b1461cef1cb37a6b7bfd37d0455e7698168fb4be1a7c75f949
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it is a link farm hosted on disposable infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=what+happened+in+1750+to+1900
    • http://vukufitu.mywebcommunity.org/78023418418.pdf
    • http://biwifizad.iblogger.org/audio_songs_mp4_free.pdf
    • http://leziwazedo.mypressonline.com/69423129588.pdf
    • http://sweetygirl.club/623897558228s1et.pdf
    • http://tadigewatogonun.22web.org/bose_wave_music_system_iii_troubleshooting.pdf
    • http://mon-cmbretagne.com/viwilegmgpjh.pdf
    • http://tivepijezar.22web.org/williams_hematology_9th_edition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ff671d67-e5c8-45be-85cb-e51ea4dbf03c/el_seor_de_las_moscas_personajes_pelicula.pdf
    • http://jazojogebi.rf.gd/fobijosodofa.pdf
    • https://s3.amazonaws.com/xakusineba/72417769457.pdf
    • https://uploads.strikinglycdn.com/files/935c06ae-636c-46bb-b555-a4472c0f2092/how_long_after_working_out_before_seeing_results.pdf
    • https://uploads.strikinglycdn.com/files/dedabc4d-bca8-42c7-9a7a-07c31c161d25/buwonowopikidomosero.pdf
    • http://sinivexoxal.epizy.com/ncbi_blast_tool.pdf
    • http://bixakisa.epizy.com/61727358132.pdf
    • https://uploads.strikinglycdn.com/files/b7cb8dda-cdfa-481a-b0dc-c91e150fb85c/59234710362.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/netozafetajero.pdf
    • https://s3.amazonaws.com/lomuper/the_georgia_guidestones_commandments.pdf
    • http://konevimojo.epizy.com/ssf2_sasuke_mod.pdf
    • http://bisiboji.rf.gd/foundations_of_python_programming.pdf
    • http://tatesit.myartsonline.com/bnf_2020_free_download.pdf
    • http://pomadepoxe.epizy.com/monsters_vs_aliens_cartoon_characters.pdf
    • http://garapaf.epizy.com/past_time_clauses_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/b6e4e3b9-a683-47f7-af78-c66ad67bbbe1/korean_from_zero_2_online.pdf
    • http://zeteximezoxa.myartsonline.com/abruzzo_guida_turistica.pdf
    • https://s3.amazonaws.com/betefowubevat/97255905033.pdf
    • http://forojiwimudobo.atwebpages.com/adverb_phrase_worksheet_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4d.bin
7ff826aa62948c553fc599023e579147ac2b5c7d3632234169ef65bc25128f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5096 bytes
font_01_sfnt_off0000f0b6.bin
0dc87bd8f14538ae047a6634877d1a63d0a9e96d3cc595ba75a3021e75e1e539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 11100 bytes
font_02_sfnt_off000115f2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 4324 bytes

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